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Help Lock screen when using Google Maps

Can anyone help with this? When using the satnav on Maps, I'd like to be able to switch off the touch-screen sensitivity, so I don't lose my destination data, etc, every time I accidentally touch the screen. Can I do this and if so, how?
PS. I have a Samsung Galaxy S3 Mini
 
I'm thinking that you want maps running, but touching the screen makes it go away. Technically it is just minimized, so touching the square will bring it back, still running as it was
 
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